mirror of
https://github.com/ceph/ceph-csi.git
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78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package fakeclient
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import (
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"context"
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"testing"
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"time"
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"k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/informers"
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"k8s.io/client-go/kubernetes/fake"
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"k8s.io/client-go/tools/cache"
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)
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// TestFakeClient demonstrates how to use a fake client with SharedInformerFactory in tests.
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func TestFakeClient(t *testing.T) {
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// Use a timeout to keep the test from hanging.
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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// Create the fake client.
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client := fake.NewSimpleClientset()
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// We will create an informer that writes added pods to a channel.
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pods := make(chan *v1.Pod, 1)
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informers := informers.NewSharedInformerFactory(client, 0)
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podInformer := informers.Core().V1().Pods().Informer()
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podInformer.AddEventHandler(&cache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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pod := obj.(*v1.Pod)
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t.Logf("pod added: %s/%s", pod.Namespace, pod.Name)
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pods <- pod
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cancel()
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},
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})
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// Make sure informers are running.
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informers.Start(ctx.Done())
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// This is not required in tests, but it serves as a proof-of-concept by
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// ensuring that the informer goroutine have warmed up and called List before
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// we send any events to it.
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for !podInformer.HasSynced() {
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time.Sleep(10 * time.Millisecond)
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}
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// Inject an event into the fake client.
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p := &v1.Pod{ObjectMeta: metav1.ObjectMeta{Name: "my-pod"}}
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_, err := client.Core().Pods("test-ns").Create(p)
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if err != nil {
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t.Errorf("error injecting pod add: %v", err)
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}
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// Wait and check result.
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<-ctx.Done()
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select {
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case pod := <-pods:
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t.Logf("Got pod from channel: %s/%s", pod.Namespace, pod.Name)
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default:
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t.Error("Informer did not get the added pod")
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}
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}
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